diff --git a/source/lib/ogl.cpp b/source/lib/ogl.cpp
index f00e666ebe..24ee50b979 100644
--- a/source/lib/ogl.cpp
+++ b/source/lib/ogl.cpp
@@ -34,7 +34,7 @@
 
 # if OS_WIN
 #  include <glad/wgl.h>
-# elif !OS_MACOSX && !OS_MAC
+# elif !OS_MACOSX
 #  include <SDL_syswm.h>
 #  if defined(SDL_VIDEO_DRIVER_X11)
 #   include <glad/glx.h>
@@ -220,7 +220,7 @@ bool ogl_HaveExtension(const char* ext)
 static int GLVersion;
 #if OS_WIN
 static int WGLVersion;
-#elif !CONFIG2_GLES && !OS_MACOSX && !OS_MAC
+#elif !CONFIG2_GLES && !OS_MACOSX
 #if defined(SDL_VIDEO_DRIVER_X11)
 static int GLXVersion;
 #endif
@@ -428,7 +428,7 @@ bool ogl_SquelchError(GLenum err_to_ignore)
 
 #if OS_WIN
 bool ogl_Init(void* (load)(const char*), void* hdc)
-#elif !CONFIG2_GLES && !OS_MACOSX && !OS_MAC
+#elif !CONFIG2_GLES && !OS_MACOSX
 bool ogl_Init(void* (load)(const char*), void* display, int subsystem)
 #else
 bool ogl_Init(void* (load)(const char*))
@@ -458,7 +458,7 @@ bool ogl_Init(void* (load)(const char*))
 		LOAD_ERROR("Failed to load WGL functions.");
 		return false;
 	}
-# elif !OS_MACOSX && !OS_MAC
+# elif !OS_MACOSX
 	const SDL_SYSWM_TYPE sysWMType = static_cast<SDL_SYSWM_TYPE>(subsystem);
 #  if defined(SDL_VIDEO_DRIVER_X11)
 	if (sysWMType == SDL_SYSWM_X11)
@@ -522,7 +522,7 @@ void ogl_SetVsyncEnabled(bool enabled)
 #if !CONFIG2_GLES && OS_WIN
 	if (ogl_HaveExtension("WGL_EXT_swap_control"))
 		wglSwapIntervalEXT(interval);
-#elif !CONFIG2_GLES && !OS_MACOSX && !OS_MAC
+#elif !CONFIG2_GLES && !OS_MACOSX
 #if defined(SDL_VIDEO_DRIVER_X11)
 	if (GLXVersion && ogl_HaveExtension("GLX_SGI_swap_control"))
 		glXSwapIntervalSGI(interval);
diff --git a/source/lib/ogl.h b/source/lib/ogl.h
index 2c843bd2a7..a05c71ab59 100644
--- a/source/lib/ogl.h
+++ b/source/lib/ogl.h
@@ -46,7 +46,7 @@
  **/
 #if OS_WIN
 extern bool ogl_Init(void* (load)(const char*), void* hdc);
-#elif !OS_MACOSX && !OS_MAC && !CONFIG2_GLES
+#elif !OS_MACOSX && !CONFIG2_GLES
 extern bool ogl_Init(void* (load)(const char*), void* display, int subsystem);
 #else
 extern bool ogl_Init(void* (load)(const char*));
diff --git a/source/lib/sysdep/os.h b/source/lib/sysdep/os.h
index 7b09464de9..9a3ae14777 100644
--- a/source/lib/sysdep/os.h
+++ b/source/lib/sysdep/os.h
@@ -91,12 +91,6 @@
 #else
 # define OS_BEOS 0
 #endif
-// Mac OS 9 or below
-#if defined(macintosh)
-# define OS_MAC 1
-#else
-# define OS_MAC 0
-#endif
 // Amiga
 #if defined(AMIGA)
 # define OS_AMIGA 1
diff --git a/source/scriptinterface/tests/test_Module.h b/source/scriptinterface/tests/test_Module.h
index b9417cbbba..cbfaeb1cc4 100644
--- a/source/scriptinterface/tests/test_Module.h
+++ b/source/scriptinterface/tests/test_Module.h
@@ -29,13 +29,13 @@
 #include "scriptinterface/ScriptContext.h"
 #include "scriptinterface/ScriptInterface.h"
 
-#if OS_MAC || OS_MACOSX
+#if OS_MACOSX
 #include <CoreFoundation/CoreFoundation.h>
 #endif
 #if OS_LINUX
 #include <cstdlib>
 #endif
-#if OS_WIN || OS_WIN64 || OS_MAC || OS_MACOSX
+#if OS_WIN || OS_WIN64 || OS_MACOSX
 #include <filesystem>
 #endif
 #include <fstream>
@@ -47,7 +47,7 @@ namespace
 {
 void ClearFromCache(const VfsPath& path)
 {
-#if OS_BSD && !(OS_MAC || OS_MACOSX)
+#if OS_BSD && !OS_MACOSX
 	TS_SKIP("On BSD hotload isn't implemented.");
 #endif
 
@@ -57,7 +57,7 @@ void ClearFromCache(const VfsPath& path)
 	PDirWatch dirWatch;
 	dir_watch_Add((file.Parent() / "").string8(), dirWatch);
 
-#if OS_WIN || OS_WIN64 || OS_MAC || OS_MACOSX
+#if OS_WIN || OS_WIN64 || OS_MACOSX
 	std::filesystem::last_write_time(file.string8(), std::filesystem::file_time_type::clock::now());
 #endif
 
@@ -71,7 +71,7 @@ void ClearFromCache(const VfsPath& path)
 	while (status == INFO::SKIPPED)
 	{
 		status = ReloadChangedFiles();
-#if OS_MAC || OS_MACOSX
+#if OS_MACOSX
 		// Console apps don't have a run loop, so we need to wait
 		// a bit for the file watcher to catch up.
 		CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, true);